51685516642827 has 8 divisors (see below), whose sum is σ = 68924072388816. Its totient is φ = 34451985996032.

The previous prime is 51685516642813. The next prime is 51685516642861. The reversal of 51685516642827 is 72824661558615.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51685516642827 - 2⁴ = 51685516642811 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51685516642897) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1256250798 + ... + 1256291939.

It is an arithmetic number, because the mean of its divisors is an integer number (8615509048602).

Almost surely, 2^{51685516642827} is an apocalyptic number.

51685516642827 is a deficient number, since it is larger than the sum of its proper divisors (17238555745989).

51685516642827 is a wasteful number, since it uses less digits than its factorization.

51685516642827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2512549597.

The product of its digits is 193536000, while the sum is 66.

The spelling of 51685516642827 in words is "fifty-one trillion, six hundred eighty-five billion, five hundred sixteen million, six hundred forty-two thousand, eight hundred twenty-seven".